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  <title>Enters a required event method feature that the application demands</title>

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</div><hr /><div id="eventconfig.requirefeatures" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">EventConfig::requireFeatures</h1>
  <p class="verinfo">(PECL event &gt;= 1.2.6-beta)</p><p class="refpurpose"><span class="refname">EventConfig::requireFeatures</span> &mdash; <span class="dc-title">Enters a required event method feature that the application demands</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-eventconfig.requirefeatures-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="type">bool</span> 
   <span class="methodname"><strong>EventConfig::requireFeatures</strong></span>
    ( <span class="methodparam">
    <span class="type">int</span>
     <code class="parameter">$feature</code>
   </span>
   )</div>

  <p class="para rdfs-comment">
   Enters a required event method feature that the application demands
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-eventconfig.requirefeatures-parameters">
  <h3 class="title">参数</h3>
  <dl>

   
    <dt>

     <em><code class="parameter">feature</code></em>
    </dt>

    <dd>

     <p class="para">
      Bitmask of required features. See
      <a href="class.eventconfig.html#eventconfig.constants" class="link">
       <em>EventConfig::FEATURE_*</em> constants</a>
     </p>
    </dd>

   
  </dl>

 </div>

 <div class="refsect1 returnvalues" id="refsect1-eventconfig.requirefeatures-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
 </div>

 <div class="refsect1 examples" id="refsect1-eventconfig.requirefeatures-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-4169">
   <p><strong>Example #1 
    <span class="function"><strong>EventConfig::requireFeatures()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$cfg&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">EventConfig</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">//&nbsp;Create&nbsp;event_base&nbsp;associated&nbsp;with&nbsp;the&nbsp;config<br /></span><span style="color: #0000BB">$base&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">EventBase</span><span style="color: #007700">(</span><span style="color: #0000BB">$cfg</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Require&nbsp;FDS&nbsp;feature<br /></span><span style="color: #007700">if&nbsp;(</span><span style="color: #0000BB">$cfg</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">requireFeatures</span><span style="color: #007700">(</span><span style="color: #0000BB">EventConfig</span><span style="color: #007700">::</span><span style="color: #0000BB">FEATURE_FDS</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"FDS&nbsp;feature&nbsp;is&nbsp;now&nbsp;requried\n"</span><span style="color: #007700">;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$base&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">EventBase</span><span style="color: #007700">(</span><span style="color: #0000BB">$cfg</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;(</span><span style="color: #0000BB">$base</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getFeatures</span><span style="color: #007700">()&nbsp;&amp;&nbsp;</span><span style="color: #0000BB">EventConfig</span><span style="color: #007700">::</span><span style="color: #0000BB">FEATURE_FDS</span><span style="color: #007700">)<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;and&nbsp;print(</span><span style="color: #DD0000">"FDS&nbsp;-&nbsp;arbitrary&nbsp;file&nbsp;descriptor&nbsp;types,&nbsp;and&nbsp;not&nbsp;just&nbsp;sockets\n"</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>以上例程的输出类似于：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
FDS feature is now requried
FDS - arbitrary file descriptor types, and not just sockets
</pre></div>
   </div>
  </div>
 </div>

 <div class="refsect1 seealso" id="refsect1-eventconfig.requirefeatures-seealso">
  <h3 class="title">参见</h3>
  <ul class="simplelist">
   <li class="member">
    <span class="methodname"><a href="eventbase.getfeatures.html" class="methodname" rel="rdfs-seeAlso">EventBase::getFeatures()</a> - Returns bitmask of features supported</span>
   </li>
  </ul>
 </div>

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